docs: def file_to_attachment(filename, filehandler=None):
      """
      Convert a file to attachment
      """
      if filehandler:
          return {'_name': filename,
                  'content': base64.b64encode(filehandler.read())
          }
      with open(filename, 'rb') as _file:
          return {'_name': filename,
                  'content': base64.b64encode(_file.read())
          }